Sofa



FIG. 1 is a front view of the sofa;

FIG. 2 is a left view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left perspective view thereof; and,

FIG. 8 is a right perspective view thereof. 

CLAIM The ornamental design for a sofa, as shown and described. 